the option to use a workspace larger than A0 paper would be helpful for larger projects. The best solution in my opinion would be the possibility to enter custom "paper" dimensions. While this probably isn't a good idea for finished UML projects, it would be an especially helpful feature for the reverse class diagram generation of larger projects.

Ten years ago when I started Bouml development a canvas with A0 format sized 3364 x 4756 wasn't supported on all computers, but yes now they can do more.I will consider to allow custom dimension as you request